Vacuum motor



July 14, 1931. E. DOBROWSKY 1,814,903

VACUUM MOTOR Original Filed May 9, 1927 s Sheets-Sheet 1 v INVENTOR filTNFSSZiJLM EmmargzYLel ,DO&I'O ZU6@% Mm ATTORN EY July 14, 1931. E. DOBROWSKY 1,814,903

VACUUM MOTOR Original Filed May 9, 1927 5 Shets-Sheet 2 florowal y M%) v ATTORN EY R mm m N g a. 3 a N M won W mw Q Q i Q NZ -m QM Q m i- E iii: I mu mm I- mm. mi mN Q m 3 an an 3 on E t w 65 h Tl. w w wk 2 Hm QM w 2 w V 3 k w an H g mm m E5 7 I a a h gm E a Q W I T N E S S E S J ry 1931. E. DbBRowsKY VACUUM MOTOR Original Filed May 9, 1927 3 Sheets-Sheet 3 K m 0 N Tw R N.0 0 w n mMm/ Z W. 6V- 8 n a m E WITNESSES Patented July 14, 1931 uNiTED STATES PATENT OFFICE EMMANUEL DOBROWSKY, OF NEW YORK, N. Y., ASSIGNOR TO MOTOR CAR ADVERTISING DEVICE 00., INC OF NEW YORK, N. Y., A CORPORATION OF NEW YORK VACUUM MOTOR Original application filed'May 9, 1927, Serial No. 189,956. Divided and this application filed August 29,

This invention relates to taxi advertising devices, an object of the invention being to provide a neat, attractive and ornamental device which can be conveniently located in a taxicab, bus, or other vehicle, and which will display advertising matter or a plurality of advertisements in succession which can be readily seen by the occupants of the vehicle.

A further object is to provide a device of this character having a suction motor oper atively connected to the manifold of an internal combustion engine such as commonly employed on taxicabs, busses and the like.

This is a division of my application for patent on taxi advertising device, filed May 9, 1927, Serial No. 189,956.

A further object is to improve uponthe construction disclosed in my copending application Serial No. 41,819, filedJuly 6, 1925.

With these and other objects in view, the

invention consists in certain novel features of construction and combinations and arrangements of parts, which will be more fully hereinafter described and pointed out in the claims. I

In the accompanying drawings Figure 1 is .a sectional plan view of my improved motor and associated parts; I

Figure 2 is a view in vert'cal longitudinal section taken on the line 22 of Figure 1;

Figure 3 is a view in transverse section through a cylinder and the reciprocating frame, the view being taken on the line 3-3 of Figure 2;

Figure 4 is a view in longitudinal section through the suction motor showing the same in connection with adjacent parts;

Figure 5 is a view similar to Figure 4, showing the parts in a different position;

Figure 6 is a fragmentary plan view of the ratchet pawl 52 and its mounting;

Figure 7 is a view in front elevation, showing the valve controlling mechanism of the suction motor;

Figure 8 is a view similar to Figure 7, showing the parts in .a different position;

Figure 9 is a view in transverse section on the line 9-9 of Figure 7;

Figure 10 is a view 1n elevation, somewhat spectively.

Serial No. 302,821. I

diagrammatically illustrating the operation 3 of the ratchet pawl 52;

Figure 11 is a perspective view of the slide plate 23;

Figure 12 is a view partly in elevation and partly in section showing my improved device in connection with a taxicab.

1 represents the casing of my improved taxi advertising device, illustrated in de tail in Figures 1 to 12, inclusive. This casing 1 is located in the upper front portion of the passenger compartment of a taxicab 2 or other analogous vehicle so that it may ple f'eadily seen by the occupants of the ve- The suction motor A, shown in longitudinal section in Figures 4 and 5, includes a pair of alined cylinders 15 and 16 open at the outer ends and secured to a central head 17 The open outer end of the cylinders 15 and 16 have central bearings 18 for piston rods 19,

and said piston rods are secured to pistons the mounting and guidance of a sliding plate 23, shown in perspective in Figure 11.

The head 17 is provided with a pair of transversely positionedvalves 24 and 25, re-

These valves 24 and 25 have longitudinal ports 26 and 27 in their respective ends. Blocks 28 are secured on the valves 24 and 25 intermediate their ends and are movable in recesses 29 in the head 17. These blocks'are cushioned at their ends to prevent noise of contact with the walls of the recesses, and coil springs 30 are located around the valves between the blocks and valves of the recesses, tending to move the valves in one direction.

31 represents a manifold which is secured to the head 17 and is always in direct communication with the ports 26 in both of the valves 24 and 25. This manifold may be connected by a pipe 32 with the manifold 33 of the engine 34 so as to establish suction in the pipe and manifold 31.

The valves 24 and '25 are adapted to pro ject through the head opposite to the point of attachment of the manifold 31 and have bevelled ends 35 which are adapted to be engaged in turn by the slide plate 23 above referred to.

The slide plat-e 2-3has a longitudinal slot 36 therein receiving a pin or fixed guide member 37 on the head 17, and enlargements 38 are provided on the ends of the slide plate 23 which are'alternately engaged by apivoted arm 89 mounted in the fram'e'21. This arm 39 is pivotally mounted between its ends on the frame 21 and is connected at one endby a coil spring 40 to the frame 21. y

It will be noted that this spring 40 is dis posed parallel to the arm when the arm is in vertical position but when the armis moved past vertical position or past deadce'r'i'terthe spring will throw the arm to either of its extreme positions, and when the lower end -.of this a'rn'iengages the respective en larg'ements 38' on plate 23 it will slide the same from one position to another.

When the plate is slid to one position, as shown in Figure 4 ,-t hevalve 25 will be forced inwardly while the'valve 24 will be permitted to project outvva rdl'y and beheld in this position by its spring 30. When the valves are in the position shown- Figure 4 air is sucked through the port 26 of the valve 24, drawing the piston 20 in the cylinder 15a ward the central head 17, at the same time, when the piston 20 in cylinder 16 moves outthrough the port 27 in valve 25';

When the arm 39' is moved to a reversed position the position of the valves will be reversed and the operation will of course be reversed with respect to the pistons inthe cylinders.

The piston rods 19 above referred-to are wardly, it will suck air into the cylinder secured to a rod frame 41 carrying the rings 42 mounted to slide on the cylinders 15' and 16, and these rings 42 have keyways 43 there in receiving keys 44 on the cylinders to prevent turning motion of the rod frame on the cylinders.

The rings 42 of the ro'd'frame 41 have fingers 45 thereon, which are adapted to engage the ends of a sliding rod'46 mounted in the frame 21 and extending through a slot 47 in the arm 39; On this rod 46 a pair of spaced cushioned bumpers 48 is located and is adapted to engage the arm 39 and force it from one extreme position to a point beyond the dead center thereof when the spring 40 completes the throw of the arm to operate the plate 23 and shift the positions of the valves 24 and 25.

Various changes and alterations might be made in the general form of the parts described without departing from the invention and hence I do not limit myself to the precise details set forth but consider myself at libertyto make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

I claim:

1. A suction motor, comprising a pair of alinedcylinders, a' central head between the cylinders, pistons in the cylinders, a pair of spring-pressed valves located in the head and having ports in their respective ends, an outlet manifold connected to' the head and com adapted to throw the'same' from side tosi'de' after the arm has passed its dead center, enlargements on the plate' engaged by the arm to shift the position of the plate, and means operated by thesuction motor to'move the arr'n.-

2-. A- suction'motor, comprising a pair of alined cylinders, a central headbetween the cylinders, pistons in the cylinders,- a pair of spring-pressed valves located in the head and having ports in their respectiveends, an out-- let manifold connected to the head and coinmunicating with the ports in one end of each I valve, springs exerting pressure on the valves to move them 111 0118- direction-,- said valves havingbeveled ends prO ect'ing beyond the head, a sliding plate engaging the beveled ends of the valves'and causing them to shift from one position to another,- a pivoted arm, a spring engaging one end of the armand adaptedto throw the same from side to side after the arm has passed its dead-center, en-' largements on the plate engaged by the arm to shift the position of the plate, a rod frame moved by thesuction motor, a movable rod,

bumpers on the rod adapted to engage andshift the position of the arm, and devices on the rod'fra-me engaging the ends of the arm to cause thelatter to move longitudinally first in one direction and then in the other. EMMANUEL DOBROWVSKY.

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